Question

Refraction of light and total internal reflection of light (in 2 points)

Answer 1

Total internal reflection, or TIR as it is intimately called, is the reflection of the total amount of incident light at the boundary between two media. 

Answer 2

heya here is your answer

Total Internal Reflection;
When the angle of incidence is greater than critical angle,the light ray gets reflected into the denser medium at the interface that is, light never enters the rarer medium.This phenomenon is called TIR
Refraction Of light;
The process of changing speed at an interface when light travel from one medium to another resulting in a change in direction is refraction of light.
hope it helps u